Abstract
Irrigation with diluted seawater would be an alternative water resource which can play an important role under scarce resources of freshwater for promoting agricultural production in coastal areas. Salvadora persica Linn. was irrigated with different concentrations of seawater (0, 10, 20, 40, 60, 80 and 100 % seawater), and their effect on plant growth, nutrient contents in soil and plants, shift in soil microbial community structure (phospholipid fatty acid; PLFA) and community-level physiological profiling (CLPP, Biolog ECO MicroPlate) were studied. Plant dry matter was significantly increased with all seawater treatments, and highest increase was at 20 % seawater treatment. Sodium and chloride contents were significantly increased, whereas ratios of K/Na and Ca/Na were significantly decreased in plants with seawater irrigation. Soil electrical conductivity (EC), available K and Na were significantly increased with increasing the concentration of seawater. Total PLFA concentration and PLFA profile of soils were used as indices of total microbial biomass and community composition, respectively. The concentrations of total PLFA, gram-positive, gram-negative and actinomycetes biomarker PLFAs were significantly reduced at 20, 40, 80 and 40 % concentrations of seawater, respectively. The application of different concentrations of seawater induced a clear shift in the soil microbial community structure toward the bacterial abundance. The microbial community structure and community-level physiological profiling in seawater irrigation treatments had significantly differentiated. It can be concluded that irrigation with different concentrations of seawater had significant impact on soil chemical and microbial properties which is attributed due to the salinity stress.
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CSIR-CSMCRI Communication No.:55/2015. The financial support received from Council of Scientific and Industrial Research (CSIR), Govt. of India, New Delhi (BSC0117–PMSI) is thankfully acknowledged. DRC is thankful to Council of Scientific and Industrial Research (CSIR), New Delhi (India) for EMPOWER project.
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Chaudhary, D.R., Rathore, A.P. & Jha, B. Effects of seawater irrigation on soil microbial community structure and physiological function. Int. J. Environ. Sci. Technol. 13, 2199–2208 (2016). https://doi.org/10.1007/s13762-016-1047-7
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DOI: https://doi.org/10.1007/s13762-016-1047-7